Added code to verify the session is deleted

Changes:
   - Keywords added "Verify Redfish Session Deleted",
     "Verify Redfish List Of Session Deleted"

Change-Id: Ibccf9ba19148cce111b0ed905b5cbf3d11ed7260
Signed-off-by: Sushil Singh <susilsi7@in.ibm.com>
diff --git a/openpower/ext_interfaces/test_lock_management.robot b/openpower/ext_interfaces/test_lock_management.robot
index 4d561ec..a540f23 100644
--- a/openpower/ext_interfaces/test_lock_management.robot
+++ b/openpower/ext_interfaces/test_lock_management.robot
@@ -275,6 +275,56 @@
     [Return]  ${message}
 
 
+Verify Redfish Session Deleted
+    [Documentation]  Verify the redfish session is deleted.
+    [Arguments]  ${session_info}
+
+    # Description of argument(s):
+    # session_info    Session information are stored in dictionary.
+
+    # ${session_info} = {
+    #     'SessionIDs': 'XXXXXXXXX',
+    #     'ClientID': 'XXXXXX',
+    #     'SessionToken': 'XXXXXXXXX',
+    #     'SessionResp': session response from redfish login
+    # }
+
+    # SessionIDs   : Session IDs
+    # ClientID     : Client ID
+    # SessionToken : Session token
+    # SessionResp  : Response of creating an redfish login session
+
+    ${sessions}=  Redfish.Get Properties  /redfish/v1/SessionService/Sessions
+
+    FOR  ${session}  IN  @{sessions['Members']}
+      Should Not Be Equal As Strings  session  ['/redfish/v1/SessionService/Sessions/${session_info["SessionIDs"]}']
+    END
+
+
+Verify Redfish List Of Session Deleted
+    [Documentation]  Verify all the list of redfish session is deleted.
+    [Arguments]  ${session_info_list}
+
+    # Description of argument(s):
+    # session_info_list    List contains individual session record are stored in dictionary.
+
+    # ${session_info_list} = [{
+    #     'SessionIDs': 'XXXXXXXXX',
+    #     'ClientID': 'XXXXXX',
+    #     'SessionToken': 'XXXXXXXXX',
+    #     'SessionResp': session response from redfish login
+    # }]
+
+    # SessionIDs   : Session IDs
+    # ClientID     : Client ID
+    # SessionToken : Session token
+    # SessionResp  : Response of creating an redfish login session
+
+    FOR  ${session_record}  IN  @{session_info_list}
+      Verify Redfish Session Deleted  ${session_record}
+    END
+
+
 Redfish Post Acquire Lock
     [Documentation]  Acquire and release lock.
     [Arguments]  ${lock_type}  ${status_code}=${HTTP_OK}